1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
|
/*
* InspIRCd -- Internet Relay Chat Daemon
*
* Copyright (C) 2009-2010 Daniel De Graaf <danieldg@inspircd.org>
* Copyright (C) 2009 Uli Schlachter <psychon@znc.in>
* Copyright (C) 2007-2008 Craig Edwards <craigedwards@brainbox.cc>
*
* This file is part of InspIRCd. InspIRCd is free software: you can
* redistribute it and/or modify it under the terms of the GNU General Public
* License as published by the Free Software Foundation, version 2.
*
* This program is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
* FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
* details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "inspircd.h"
#include "exitcodes.h"
#include <sys/types.h>
#include <sys/event.h>
#include <sys/time.h>
#include "socketengine.h"
#include <iostream>
#include <sys/sysctl.h>
/** A specialisation of the SocketEngine class, designed to use BSD kqueue().
*/
namespace
{
int EngineHandle;
unsigned int ChangePos = 0;
/** These are used by kqueue() to hold socket events
*/
std::vector<struct kevent> ke_list(16);
/** Pending changes
*/
std::vector<struct kevent> changelist(8);
}
/** Initialize the kqueue engine
*/
void SocketEngine::Init()
{
MAX_DESCRIPTORS = 0;
int mib[2];
size_t len;
mib[0] = CTL_KERN;
#ifdef KERN_MAXFILESPERPROC
mib[1] = KERN_MAXFILESPERPROC;
#else
mib[1] = KERN_MAXFILES;
#endif
len = sizeof(MAX_DESCRIPTORS);
sysctl(mib, 2, &MAX_DESCRIPTORS, &len, NULL, 0);
if (MAX_DESCRIPTORS <= 0)
{
ServerInstance->Logs->Log("SOCKET", LOG_DEFAULT, "ERROR: Can't determine maximum number of open sockets!");
std::cout << "ERROR: Can't determine maximum number of open sockets!" << std::endl;
ServerInstance->QuickExit(EXIT_STATUS_SOCKETENGINE);
}
RecoverFromFork();
}
void SocketEngine::RecoverFromFork()
{
/*
* The only bad thing about kqueue is that its fd cant survive a fork and is not inherited.
* BUM HATS.
*
*/
EngineHandle = kqueue();
if (EngineHandle == -1)
{
ServerInstance->Logs->Log("SOCKET", LOG_DEFAULT, "ERROR: Could not initialize socket engine. Your kernel probably does not have the proper features.");
ServerInstance->Logs->Log("SOCKET", LOG_DEFAULT, "ERROR: this is a fatal error, exiting now.");
std::cout << "ERROR: Could not initialize socket engine. Your kernel probably does not have the proper features." << std::endl;
std::cout << "ERROR: this is a fatal error, exiting now." << std::endl;
ServerInstance->QuickExit(EXIT_STATUS_SOCKETENGINE);
}
}
/** Shutdown the kqueue engine
*/
void SocketEngine::Deinit()
{
Close(EngineHandle);
}
static struct kevent* GetChangeKE()
{
if (ChangePos >= changelist.size())
changelist.resize(changelist.size() * 2);
return &changelist[ChangePos++];
}
bool SocketEngine::AddFd(EventHandler* eh, int event_mask)
{
int fd = eh->GetFd();
if ((fd < 0) || (fd > GetMaxFds() - 1))
return false;
if (!SocketEngine::AddFdRef(eh))
return false;
// We always want to read from the socket...
struct kevent* ke = GetChangeKE();
EV_SET(ke, fd, EVFILT_READ, EV_ADD, 0, 0, static_cast<void*>(eh));
ServerInstance->Logs->Log("SOCKET", LOG_DEBUG, "New file descriptor: %d", fd);
eh->SetEventMask(event_mask);
OnSetEvent(eh, 0, event_mask);
ResizeDouble(ke_list);
return true;
}
void SocketEngine::DelFd(EventHandler* eh)
{
int fd = eh->GetFd();
if ((fd < 0) || (fd > GetMaxFds() - 1))
{
ServerInstance->Logs->Log("SOCKET", LOG_DEFAULT, "DelFd() on invalid fd: %d", fd);
return;
}
// First remove the write filter ignoring errors, since we can't be
// sure if there are actually any write filters registered.
struct kevent* ke = GetChangeKE();
EV_SET(ke, eh->GetFd(), EVFILT_WRITE, EV_DELETE, 0, 0, NULL);
// Then remove the read filter.
ke = GetChangeKE();
EV_SET(ke, eh->GetFd(), EVFILT_READ, EV_DELETE, 0, 0, NULL);
SocketEngine::DelFdRef(eh);
ServerInstance->Logs->Log("SOCKET", LOG_DEBUG, "Remove file descriptor: %d", fd);
}
void SocketEngine::OnSetEvent(EventHandler* eh, int old_mask, int new_mask)
{
if ((new_mask & FD_WANT_POLL_WRITE) && !(old_mask & FD_WANT_POLL_WRITE))
{
// new poll-style write
struct kevent* ke = GetChangeKE();
EV_SET(ke, eh->GetFd(), EVFILT_WRITE, EV_ADD, 0, 0, static_cast<void*>(eh));
}
else if ((old_mask & FD_WANT_POLL_WRITE) && !(new_mask & FD_WANT_POLL_WRITE))
{
// removing poll-style write
struct kevent* ke = GetChangeKE();
EV_SET(ke, eh->GetFd(), EVFILT_WRITE, EV_DELETE, 0, 0, NULL);
}
if ((new_mask & (FD_WANT_FAST_WRITE | FD_WANT_SINGLE_WRITE)) && !(old_mask & (FD_WANT_FAST_WRITE | FD_WANT_SINGLE_WRITE)))
{
struct kevent* ke = GetChangeKE();
EV_SET(ke, eh->GetFd(), EVFILT_WRITE, EV_ADD | EV_ONESHOT, 0, 0, static_cast<void*>(eh));
}
}
int SocketEngine::DispatchEvents()
{
struct timespec ts;
ts.tv_nsec = 0;
ts.tv_sec = 1;
int i = kevent(EngineHandle, &changelist.front(), ChangePos, &ke_list.front(), ke_list.size(), &ts);
ChangePos = 0;
ServerInstance->UpdateTime();
if (i < 0)
return i;
stats.TotalEvents += i;
for (int j = 0; j < i; j++)
{
struct kevent& kev = ke_list[j];
EventHandler* eh = static_cast<EventHandler*>(kev.udata);
if (!eh)
continue;
// Copy these in case the vector gets resized and kev invalidated
const int fd = eh->GetFd();
const short filter = kev.filter;
if (fd < 0)
continue;
if (kev.flags & EV_EOF)
{
stats.ErrorEvents++;
eh->HandleEvent(EVENT_ERROR, kev.fflags);
continue;
}
if (filter == EVFILT_WRITE)
{
stats.WriteEvents++;
/* When mask is FD_WANT_FAST_WRITE or FD_WANT_SINGLE_WRITE,
* we set a one-shot write, so we need to clear that bit
* to detect when it set again.
*/
const int bits_to_clr = FD_WANT_SINGLE_WRITE | FD_WANT_FAST_WRITE | FD_WRITE_WILL_BLOCK;
eh->SetEventMask(eh->GetEventMask() & ~bits_to_clr);
eh->HandleEvent(EVENT_WRITE);
}
else if (filter == EVFILT_READ)
{
stats.ReadEvents++;
eh->SetEventMask(eh->GetEventMask() & ~FD_READ_WILL_BLOCK);
eh->HandleEvent(EVENT_READ);
}
}
return i;
}
|
